title: Pigmented villonodular synovitis of the temporomandibular joint: CT imaging findings.
abstract: OBJECTIVE
  The purpose of this study was to determine the characteristic computed tomography (CT) findings of pigmented villonodular synovitis (PVNS) of the temporomandibular joint (TMJ).
  
  
  METHODS
  Eight subjects with PVNS were examined with both pre and post contrast CT scans. All lesions were histopathologically confirmed through surgery. CT appearances of the lesions were reviewed.
  
  
  RESULTS
  Among the eight subjects, 8 (100%) demonstrated soft tissue mass and enhancement after contrast administration, 6 (75%) appeared as all or focal areas of noncontrast hyperdensity, 6 (75%) had widening of the joint spaces. Bony erosion of the mandibular condyles and articular surfaces were found in 7 (87.5%) and 6 (75%) subjects, respectively.
  
  
  CONCLUSIONS
  Based on the CT findings, PVNS of the TMJ is characterized by hyperdensity soft tissue mass and further increase in density after contrast administration, bony destruction of the mandibular condyles and skull base, and intracranial extension.
authors.affiliation: Department of Radiology, Shanghai 6th People's Hospital, Affiliated to Shanghai JiaoTong University, No. 600 Yi Shan RD, 200233 Shanghai, China. Electronic address: aesop.le@163.com.
authors.forename: Wei-Jie
authors.initials: WJ
authors.lastname: Le
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yu
authors.forename: Hui-Min
authors.initials: HM
authors.lastname: Shi
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013586:Synovitis, Pigmented Villonodular / Q000000981:diagnostic imaging*; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed
keywords: CT; PVNS; TMJ